“…In this respect, the solid-state and aquatic chemistry of tricalcium aluminate, Ca 3 Al 2 O 6 or C 3 A (where C = CaO, A = Al 2 O 3 according to the conventional notation) is of particular interest, since it is the most reactive clinker phase upon hydration, amounting to 4-11 % of Portland cement [8,[17][18][19][20][21][22]. C 3 A is also present in alternative formulations, such as calcium sulfoaluminate [23][24][25][26][27] cements, proposed to be a 'greener' alternative to Portland cement due to its lower CO 2 emission, lower sintering temperature, better chemical resistance, faster setting, etc.…”